Better music and movie experience TDK Life on Record Over-Ear Headphones feature an in-line mic and remote for controlling phone calls, track selection, and volume on select iPod and iPhone devices and Samsung Galaxy SII/SIII/ SIV phones. Designed with ultra comfortable ear cups, the ST170 headphones produce rich acoustic sound for a superior listening experience. Specification Plug Type: 3.5 mmDriver Diameter: 40 mmDriver Type: DynamicFrequency Response: 20 - 20,000 HzSensitivity: 104 dB 3 dBImpedance: 32 ohms 10%Cord Length: 1.2 m/4 ft